Mold in which to form plastic articles.



L. P. ROBERTS. MOLQ IN WHICH TO FORM PLASTIC ARTICLES.

APPLICATION IILBD AUG. 2, 1909.

Patented Mar. 15, 1910.

INVENTOR 11m: R ROBERTJ WI TNESSES A TTORNE Y J UNITED STAWENT onn on.

. LINAS P. ROEERTS, O F IVIUNCIE, INDIANA ASSIGNO R F ONE-THIRD T0 HAYES MOGIBBEN'Y. OF MUNCIE, INDIANA. I 1' MOLD IN WHICH TO FORM PLASTIC ARTICLES.

To all whom it may concern.- 'Be'it known that I, LINAS P. ROBERTS, a

I citizen of the United States, and a resident .Of the city of Muncie, in the county of Delaware and State of Indiana, have invented a new and useful Mold in Which to Form Plastic Articles, of which invention the followingisa specification.

My invention relates to improvements in the'a rt of making articles of plastic material, and more particularly to that .of the manufacture of glass insulators. I

An insulator of ver desirable form and structure" which COHtEllIlS improvements invented and perfected 'byIm'e is shown in the drawings which form apart of this specification.

In the views which illustrate this glass insulatorgFigure l isa side view, and'Fig. 2 is a vertical transverse sectional-view, and

Fig. 3 is ahorizontal transverse sectional view taken oii'the li'ne 3-3 Fig. 2. Fig. 4- is a top plan view.

The essentiahfeatures of this insulator are that the top portion of same has the vertical slit or bifurcation 'A the bottom of which slit terminates in the transverse openings B B that extend in each direction from the center and through the body insulator.

In the use of this insulator it is fastened on the cross arm or other object in; the usual way, an in such position with reference to the line wire that the latter is let down into the slit A and then deflected laterally, or

of the .the insulator is turned slightly in a rotary direction, the line Wire will then reside in the transverse. openings B B and will be held against vertical and also against transverse movement.

A form .of insulator embodying the above 'generalfeature of the vertical slit and transverse openings is illustrated iii United States Letters Patent dated August numbered 707 ,429. a I

It will be observed that 'the insulator shown in this application besides having the foregoing features of general construction has the rounded top '0, the flared body portionD, and the recessed interior; The emi- 19, 1902, and

Ljnently practicable material for this insula-- made of such material.

toris'glass; the difficulty however has been that; hitherto no means have been devised whereby this insulat0rcould be practicably ing economically manufactured? Specification ofLetters Patent. Patented 15, 1910. nppliat'ibnifiled August 2, 1909: Serial No. sioa'zs. i

The contour and general "form of this insulator has been designed generally ,With a view 'not only .to makingitthoroughly efficient to perform" its functions,-I-but to produce an"insul ator that iscaPabIe of be- The objects of the invention which forms insulators of the character! above referred to may be made of glass,economically. and

rapidly, and which insulatorswill be accurate in dimensions,"contour, and weight;

the subject of this application are to provide I a molding device or mechanism whereby- These general objects and other objects of more specific character as will presently appear, are accomplished by and my inven- 5 tion consists of thenew construction, combination and arrangement of parts described in this specification, illustrated in the accompanying drawings, and clearly defined in the appended claims.

In the drawings, corresponding parts are indicated by similar characters of reference throughout the several views, in which I Fig. 5 represents a verticalcentralsectional view of my newly invented-mechanism, there-beingalso shown in the saidg=view a sufiicient portion of-the certain mechanical partsvvell known, and-necessary io pe'r form the function of forming the threaded hole in the-insulator and for pressingthe plastic material in the mold. -Fi'g. this a plan View of the mold. Fig; '1 is a-horizontal transverse sectional view of the: mold taken on the line 77.Fig. .5, one'jhalf-section of the mold having'beeii nio'veclto the open position. Fig. 8 isaa horizoiitalsectional view of the moldst-akenion; the line ,7-7 in Fig. 5, both half-sectious-ofi the mold having been moved to'the'open position. Fig. 9 isa vertical transvei'sesectioiial'view taken on'the line 99 Fig. '6.

My improved mold which is composed of moved. successively into position underneath the parts that form the bottom of the inthe complemental half-sections'Fi E :and the i sulator, and that form the threaded hole in same: The raised circular port-ion i F has the cup-shaped recess F in which i'sthe 'integrally formed partition I. In the form of mechanism shown herein,- the same being intended to 'form an insulator of substan- The thickness of this partition is'that of the tially the-design as shown in Fig. 1, the said partition stands at an angle of45 degrees-to theylin of division of the mold half-sections.

width desired for'the slit AQ raised circulanportion. F of the base-plate. The annular bead J will-'formthe peripheral recess Kin the insulator. Projectlng from the lower part of the wall, faces are the angular tongues L. I These tongues have a thickness that'of the-width desired for the a .tb afford the proper draft when the mold half-sectionsare moved-apart and when the openings B B and areso formed that when the half-sections of "the mold are closed together as shown in Fig. 6 oneed e of each of the said angular tongues w'l register with the-edge of the partition I, and the.

ends of 'saidangular tongues will meeteach other, directlyabove and registration with thetop ofthe partition I. ;These niold half-sections are provided-with the usual handles M having a suitable locking de%. vice M whereby the half-sections may .be

held securely together. The arms E are pivotally secured to the stud. F i of the base plateF.

- In order to. more clearly'illustrate and explain the functions performed by my invention -I have shown an'arrangement of mechanism adjacent thereto for the manipula-' tion of'the pressing head 0 and the mold bar P. The mold bar moves slidingly in the hollow bar (land has its lower portion P ta ered and threaded. The'pressing head hollow bar Q, and has the annular tongue Q I The hollow bar is disposed" slidingly in'thevarm R which isv supported in theupright S that forms part. of the frame H.

By the suitable hand levers T' and U having connections with the mold bar, P and the hollow bar Q respectively, the mold bar and the-pressing head may be operated inde- The said pressin pendently of each other.

headand mold bar when not operating wil occupy the positions as-shown by the dotted In the practice of my invention the mold half-sections occupy the'closed' position as shown in Fig. 6. A chargeof molten glass is delivered into the mold. The mold bar is lowered, and then the pressing head is lowered' to the position as shown in ig. 5. In this pressing of the glass it is caused to fill the body of the mold and to fill the recess F i and -.by the partition andthe angular tongues L, the slit A and the openings B B are formed. The mold is then opened bythe moving apart of thehalf-sections. The angular tongues will leave the insulator and leave the openings B B smooth and finished;

.is'secured on the bottom end of the The pressing head isthen raised and then with the raisingof. the mold bar, the insula'toris'rai'sed from the base plate and as it leaves, same the slit A is left smooth and finished by the partition 'I. The insulator thus finished and lifted free from and apart from the -mold is then-engaged with the usual suitable hand implement'by the operative, and is unscrewed from the mold bar, and thus is accomplished the making of an insulator of the'conformation as shown in Fig.1. j

It will'be understood that thepartition I and theangular tongue L "are formed with their sides of the proper slight'bevel or slant L -A mold in which to form plastic articles .ofthe' character described, consistih of a base plate havingv a, recess in its top surtace there being a vertical partition in "the said recess, complemental mold half-sections so arranged above-the base plate that the dividing line between them isat an angle-to the longitudinal center line ofthe aforesaid artition, there being tongues projecting mm the internal walls of said half-sections and havingthe lower edges thereof. to register with the top. of saidpartition.

2. A tmold in which to form plastic articles of thecharacter described, consisting-of 'a-ba'se plate havinga circular raised portion provided with a recess, there being avertical partition in the said recess,. complemental mold half-sections soarranged. above the base plate that the dividing line between them is at an angle to the longitudinal center line of the aforesaid partition, angular horizontal tongues pro ecting from the internal Walls. of said 'half' sections and having the lower edges thereof of said partitiom- A mold in which toform plastic articles, consisting of a base '-member:-ha,vinga recess in its top surface, a pa-rtition in said recess, mold half-sections above said recess to rest on the base plate the vertical dividing line of said mold half sections being at an to register :with the top angle-to the longitudinallcenter line of the said partition, complemental angular tongues to project from the interior faces of the walls and having their lower edges to register with the top of the said partition.

In testimony whereof I have hereunto signed my name tothis specification-in the presence of two subscribing-w tnesse's.

' LINAS'P. J OBERTS. Witnesses: d

' JABEZ Moon,

THoMAs L. RY N; v 

